﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Demo
{
    class yanzi : BirdType
    {
        public void dongquchungui()
        {
            Console.WriteLine("冬去春归");
        }
        public override void cry()
        {
            base.cry();
            Console.WriteLine("吱");
        }
    }
}
